Thanks, I just signed up for the $50, too.
FYI the EV plan is based off their 5-9 am, 5-9 pm peak rates for Winter and 1-8 pm peak rates for Summer plan. It adds a super saver period from 11pm-5am for EV charging. But as I am home a lot in Summer, 1-8 pm is hard for me to observe. Too many hours of sweating! I find the 3-6pm peak rates all year plan much easier to manage. By precooling, the house is comfortable for the 3-6 pm period. Also, I will be adding a second car and intend to use the same charger for both so the less complex plan will work better. If you look at the SRP website you can compare the rates. I didn't find the SRP rep to be very useful in making the decision. There are too many variables for individual households.
Note that you can only switch plans once a year. However, you can go from a saver plan to the standard plan after a few months if it turns out that would be a better deal. Of course it would be much nicer if you could flip between the two saver plans I mentioned above since either of them is likely better than the standard plan, unless one makes no efforts to avoid peak hours.